<!-- 📚📚📚 Pro-Table 文档: https://juejin.cn/post/7166068828202336263 -->

<template>
	<!-- 查询表单 card -->
	<SearchForm
		:search="search"
		:reset="reset"
		:search-param="searchParam"
		:columns="searchColumns"
		:search-col="searchCol"
		v-show="isShowSearch"
	/>

	<!-- 表格内容 card -->
	<div class="card table-main">
		<!-- 表格头部 操作按钮 -->
		<div class="table-header">
			<div class="header-button-lf">
				<slot
					name="tableHeader"
					:selectedListIds="selectedListIds"
					:selectedList="selectedList"
					:isSelected="isSelected"
				/>
			</div>
			<div class="header-button-ri" v-if="toolButton">
				<slot name="toolButton">
					<el-button :icon="Refresh" circle @click="getTableList" />
					<el-button :icon="Printer" circle v-if="columns.length" @click="handlePrint" />
					<el-button :icon="Operation" circle v-if="columns.length" @click="openColSetting" />
					<el-button :icon="Search" circle v-if="searchColumns.length" @click="isShowSearch = !isShowSearch" />
				</slot>
			</div>
		</div>
		<!-- 表格主体 -->
		<el-table
			ref="tableRef"
			v-bind="$attrs"
			:data="tableData"
			:border="border"
			:row-key="rowKey"
			@selection-change="selectionChange"
		>
			<!-- 默认插槽 -->
			<slot></slot>
			<template v-for="item in tableColumns" :key="item">
				<!-- selection || index -->
				<el-table-column
					v-bind="item"
					:align="item.align ?? 'center'"
					:reserve-selection="item.type == 'selection'"
					v-if="item.type == 'selection' || item.type == 'index'"
				>
				</el-table-column>
				<!-- expand 支持 tsx 语法 && 作用域插槽 (tsx > slot) -->
				<el-table-column v-bind="item" :align="item.align ?? 'center'" v-if="item.type == 'expand'" v-slot="scope">
					<component :is="item.render" v-bind="scope" v-if="item.render"> </component>
					<slot :name="item.type" v-bind="scope" v-else></slot>
				</el-table-column>
				<!-- other 循环递归 -->
				<TableColumn v-if="!item.type && item.prop && item.isShow" :column="item">
					<template v-for="slot in Object.keys($slots)" #[slot]="scope">
						<slot :name="slot" v-bind="scope"></slot>
					</template>
				</TableColumn>
			</template>
			<!-- 插入表格最后一行之后的插槽 -->
			<template #append>
				<slot name="append"> </slot>
			</template>
			<!-- 表格无数据情况 -->
			<template #empty>
				<div class="table-empty">
					<slot name="empty">
						<img src="@/assets/images/notData.png" alt="notData" />
						<div>暂无数据</div>
					</slot>
				</div>
			</template>
		</el-table>
		<!-- 分页组件 -->
		<slot name="pagination">
			<Pagination
				v-if="pagination"
				:pageable="pageable"
				:handle-size-change="handleSizeChange"
				:handle-current-change="handleCurrentChange"
			/>
		</slot>
	</div>
	<!-- 列设置 -->
	<ColSetting v-if="toolButton" ref="colRef" v-model:col-setting="colSetting" />
</template>

<script setup lang="ts" name="ProTable">
import { ref, watch, computed, provide, onMounted } from 'vue'
import { useTable } from '@/hooks/useTable'
import { useSelection } from '@/hooks/useSelection'
import type { ColumnProps } from '@/components/ProTable/interface'
import { ElTable, type TableProps } from 'element-plus'
import { Refresh, Printer, Operation, Search } from '@element-plus/icons-vue'
import { filterEnum, formatValue, handleProp, handleRowAccordingToProp } from '@/utils'
import SearchForm from '@/components/SearchForm/index.vue'
import Pagination from './components/Pagination.vue'
import ColSetting from './components/ColSetting.vue'
import TableColumn from './components/TableColumn.vue'
import printJS from 'print-js'
type BreakPoint = 'xs' | 'sm' | 'md' | 'lg' | 'xl'
interface ProTableProps extends Partial<Omit<TableProps<any>, 'data'>> {
	columns: ColumnProps[] // 列配置项
	requestApi: (params: any) => Promise<any> | any // 请求表格数据的 api ==> 非必传
	requestAuto?: boolean // 是否自动执行请求 api ==> 非必传（默认为true）
	requestError?: (params: any) => void // 表格 api 请求错误监听 ==> 非必传
	dataCallback?: (data: any) => any // 返回数据的回调函数，可以对数据进行处理 ==> 非必传
	title?: string // 表格标题，目前只在打印的时候用到 ==> 非必传
	pagination?: boolean // 是否需要分页组件 ==> 非必传（默认为true）
	initParam?: any // 初始化请求参数 ==> 非必传（默认为{}）
	border?: boolean // 是否带有纵向边框 ==> 非必传（默认为true）
	toolButton?: boolean // 是否显示表格功能按钮 ==> 非必传（默认为true）
	rowKey?: string // 行数据的 Key，用来优化 Table 的渲染，当表格数据多选时，所指定的 id ==> 非必传（默认为 id）
	searchCol?: number | Record<BreakPoint, number> // 表格搜索项 每列占比配置 ==> 非必传 { xs: 1, sm: 2, md: 2, lg: 3, xl: 4 }
}

// 接受父组件参数，配置默认值
const props = withDefaults(defineProps<ProTableProps>(), {
	requestAuto: true,
	columns: () => [],
	pagination: true,
	initParam: {},
	border: true,
	toolButton: true,
	rowKey: 'id',
	searchCol: () => ({ xs: 1, sm: 2, md: 2, lg: 3, xl: 4 })
})

// 是否显示搜索模块
const isShowSearch = ref(true)

// 表格 DOM 元素
const tableRef = ref<InstanceType<typeof ElTable>>()

// 表格多选 Hooks
const { selectionChange, selectedList, selectedListIds, isSelected } = useSelection(props.rowKey)

// 表格操作 Hooks
const { tableData, pageable, searchParam, searchInitParam, getTableList, search, reset, handleSizeChange, handleCurrentChange } =
	useTable(props.requestApi, props.initParam, props.pagination, props.dataCallback, props.requestError)

// 清空选中数据列表
const clearSelection = () => tableRef.value!.clearSelection()

// 初始化请求
onMounted(() => props.requestAuto && getTableList())

// 监听页面 initParam 改化，重新获取表格数据
watch(() => props.initParam, getTableList, { deep: true })

// 接收 columns 并设置为响应式
const tableColumns = ref<ColumnProps[]>(props.columns)

// 定义 enumMap 存储 enum 值（避免异步请求无法格式化单元格内容 || 无法填充搜索下拉选择）
const enumMap = ref(new Map<string, { [key: string]: any }[]>())
provide('enumMap', enumMap)
const setEnumMap = async (col: ColumnProps) => {
	if (!col.enum) return
	// 如果当前 enum 为后台数据需要请求数据，则调用该请求接口，并存储到 enumMap
	if (typeof col.enum !== 'function') return enumMap.value.set(col.prop!, col.enum!)
	const { data } = await col.enum()
	enumMap.value.set(col.prop!, data)
}

// 扁平化 columns
const flatColumnsFunc = (columns: ColumnProps[], flatArr: ColumnProps[] = []) => {
	columns.forEach(async col => {
		if (col._children?.length) flatArr.push(...flatColumnsFunc(col._children))
		flatArr.push(col)

		// 给每一项 column 添加 isShow && isFilterEnum 默认属性
		col.isShow = col.isShow ?? true
		col.isFilterEnum = col.isFilterEnum ?? true

		// 设置 enumMap
		setEnumMap(col)
	})
	return flatArr.filter(item => !item._children?.length)
}

// flatColumns
const flatColumns = ref<ColumnProps[]>()
flatColumns.value = flatColumnsFunc(tableColumns.value)

// 过滤需要搜索的配置项
const searchColumns = flatColumns.value.filter(item => item.search?.el || item.search?.render)

// 设置搜索表单排序默认值 && 设置搜索表单项的默认值
searchColumns.forEach((column, index) => {
	column.search!.order = column.search!.order ?? index + 2
	if (column.search?.defaultValue !== undefined && column.search?.defaultValue !== null) {
		searchInitParam.value[column.search.key ?? handleProp(column.prop!)] = column.search?.defaultValue
		searchParam.value[column.search.key ?? handleProp(column.prop!)] = column.search?.defaultValue
	}
})

// 排序搜索表单项
searchColumns.sort((a, b) => a.search!.order! - b.search!.order!)

// 列设置 ==> 过滤掉不需要设置的列
const colRef = ref()
const colSetting = tableColumns.value!.filter(
	item => !['selection', 'index', 'expand'].includes(item.type!) && item.prop !== 'operation' && item.isShow
)
const openColSetting = () => colRef.value.openColSetting()

// 🙅‍♀️ 不需要打印可以把以下方法删除，打印功能目前存在很多 bug（目前数据处理比较复杂 209-246 行）
// 处理打印数据（把后台返回的值根据 enum 做转换）
const printData = computed(() => {
	const printDataList = JSON.parse(JSON.stringify(selectedList.value.length ? selectedList.value : tableData.value))
	// 找出需要转换数据的列（有 enum || 多级 prop && 需要根据 enum 格式化）
	const needTransformCol = flatColumns.value!.filter(
		item => (item.enum || (item.prop && item.prop.split('.').length > 1)) && item.isFilterEnum
	)
	needTransformCol.forEach(colItem => {
		printDataList.forEach((tableItem: { [key: string]: any }) => {
			tableItem[handleProp(colItem.prop!)] =
				colItem.prop!.split('.').length > 1 && !colItem.enum
					? formatValue(handleRowAccordingToProp(tableItem, colItem.prop!))
					: filterEnum(
							handleRowAccordingToProp(tableItem, colItem.prop!),
							enumMap.value.get(colItem.prop!),
							colItem.fieldNames
					  )
			for (const key in tableItem) {
				if (tableItem[key] === null) tableItem[key] = formatValue(tableItem[key])
			}
		})
	})
	return printDataList
})

// 打印表格数据（💥 多级表头数据打印时，只能扁平化成一维数组，printJs 不支持多级表头打印）
const handlePrint = () => {
	const header = `<div style="text-align: center"><h2>${props.title}</h2></div>`
	const gridHeaderStyle = 'border: 1px solid #ebeef5;height: 45px;color: #232425;text-align: center;background-color: #fafafa;'
	const gridStyle = 'border: 1px solid #ebeef5;height: 40px;color: #494b4e;text-align: center'
	printJS({
		printable: printData.value,
		header: props.title && header,
		properties: flatColumns
			.value!.filter(
				item => !['selection', 'index', 'expand'].includes(item.type!) && item.isShow && item.prop !== 'operation'
			)
			.map((item: ColumnProps) => ({
				field: handleProp(item.prop!),
				displayName: item.label
			})),
		type: 'json',
		gridHeaderStyle,
		gridStyle
	})
}

// 暴露给父组件的参数和方法(外部需要什么，都可以从这里暴露出去)
defineExpose({
	element: tableRef,
	tableData,
	searchParam,
	pageable,
	getTableList,
	reset,
	clearSelection,
	enumMap,
	isSelected,
	selectedList,
	selectedListIds
})
</script>

<style lang="scss" scoped>
	.table-header{
		display: flex;
		justify-content: space-between;
		margin: 10px 0;
	}
</style>
